| (19) |
 |
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(11) |
EP 1 127 924 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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17.07.2002 Bulletin 2002/29 |
| (43) |
Date of publication A2: |
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29.08.2001 Bulletin 2001/35 |
| (22) |
Date of filing: 06.02.2001 |
|
| (51) |
International Patent Classification (IPC)7: C09C 1/30 |
|
| (84) |
Designated Contracting States: |
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AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
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Designated Extension States: |
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AL LT LV MK RO SI |
| (30) |
Priority: |
24.02.2000 JP 2000047347
29.09.2000 JP 2000298207
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| (71) |
Applicant: MITSUBISHI MATERIALS CORPORATION |
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Chiyoda-ku, Tokyo 100-8117 (JP) |
|
| (72) |
Inventors: |
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- Sugino, Maki, Mitsubishi Materials Corp.
Ohmiya-shi, Saitama 330-0835 (JP)
- Hirata, Hiroki, Mitsubishi Materials Corp.
Ohmiya-shi, Saitama 330-0835 (JP)
- Ogi, Katsumi, Mitsubishi Materials Corp.
Ohmiya-shi, Saitama 330-0835 (JP)
|
| (74) |
Representative: Gille Hrabal Struck Neidlein Prop Roos |
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Patentanwälte Brucknerstrasse 20
40593 Düsseldorf
40593 Düsseldorf (DE) |
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| |
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| (54) |
Silicia powder and method for producing the same |
(57) (Object) To provide a silica powder having a good ability to adsorb an ink dye.
(Solving Means] A silica powder surface-treated with and epoxy compound having a plurality
of epoxy groups, in which at least one epoxy group of the epoxy compound is ring-opened
to bind to the surface of the silica powder and the remaining epoxy groups of the
epoxy compound are bonded to amine compounds. The silica powder can be produced by
the surface treatment of a silica powder with an epoxy compound and an amine compound
successively or with both these compounds simultaneously. The surface treatment of
the silica powder is performed with 0.1 to 60 parts by weight of an epoxy compound
having at least two epoxy groups and 0.1 to 50 parts by weight of an amine compound
in an inert gas atmosphere at 90 to 200°C.